--- title: "1.9 release notes" canonical_url: "https://www.nutrient.io/guides/web/release-notes/1-9/" md_url: "https://www.nutrient.io/guides/web/release-notes/1-9.md" last_updated: "2026-05-15T19:10:05.096Z" description: "Nutrient Web SDK 1.9 release notes summarizing feature updates, bug fixes, viewer enhancements, and guidance for smooth upgrades." --- We’re excited to announce Nutrient Web SDK 1.9, featuring an enhanced content editor and a range of stability and performance improvements. See the full details in the [changelog](https://www.nutrient.io/guides/web/changelog.md#1.9.1). ### Content editor The content editor now enables you to reuse fonts from the document itself. This means if your PDF has embedded fonts, when you edit text, the new text will look exactly like the surrounding text. Some embedded fonts (“subset fonts”) only have a limited amount of characters included, in which case, the content editor will fall back to a different font. The fallback font can be adjusted using the [`contentEditingFontMatcher`](https://www.nutrient.io/api/web/interfaces/Configuration.html#contenteditingfontmatcher) callback. The content editor now also supports preserving accessibility tags when editing text, ensuring documents remain accessible after modifications. ### Simplified deployment with CDN-hosted assets Starting with this release, the previous behavior for `baseUrl` when it isn’t set is deprecated and will result in a warning. Web SDK will transition to use CDN-hosted assets by default in the future, but you can opt in to using them right now by setting `useCDN: true` in your configuration. This update simplifies setup by removing the need to manually copy or manage assets locally. For organizations that prefer to self-host assets, this option remains available and can be configured as described in the [self-host assets](https://www.nutrient.io/guides/web/self-host-assets.md) guide. ### Password-protected PDFs in AI Assistant Starting with this release, AI Assistant can now process password-protected PDFs. This enhancement expands the range of documents that can be analyzed securely and doesn’t require any additional setup. AI Assistant automatically uses the same password configuration already provided when opening a document, ensuring a seamless and secure experience. ### Update UI customization configuration at runtime Starting with this release, Web SDK introduces the `Instance.setUI` method for updating user interface (UI) configuration slots at runtime, enabling a more dynamic user experience. For detailed instructions and examples, refer to the [set UI customization configuration](https://www.nutrient.io/guides/web/user-interface/ui-customization/set-ui.md) guide. ### New supported file type Nutrient Web SDK 1.9 adds support for converting and opening text files (`.txt`) with the corresponding license component. This enhancement broadens the range of document types that can be viewed and edited within the SDK. ### Performance and stability improvements This release includes numerous fixes and enhancements aimed at improving performance and stability across the SDK. Minimum Document Engine version required: [1.5.6](https://www.nutrient.io/guides/document-engine/changelog.md#1.5.6) For a complete list of changes, bug fixes, and performance improvements, refer to the [changelog](https://www.nutrient.io/guides/web/changelog.md#1.9.1). For previous release notes, refer to the [Web SDK 1.8 release notes](https://www.nutrient.io/guides/web/release-notes/1-8.md). We appreciate your feedback and contributions as we continue to enhance Nutrient Web SDK. --- ## Related pages - [1 11](/guides/web/release-notes/1-11.md) - [1 1](/guides/web/release-notes/1-1.md) - [1 12](/guides/web/release-notes/1-12.md) - [1 0](/guides/web/release-notes/1-0.md) - [1 13 1](/guides/web/release-notes/1-13-1.md) - [1 10](/guides/web/release-notes/1-10.md) - [1 13](/guides/web/release-notes/1-13.md) - [1 14](/guides/web/release-notes/1-14.md) - [1 4](/guides/web/release-notes/1-4.md) - [1 15](/guides/web/release-notes/1-15.md) - [1 2](/guides/web/release-notes/1-2.md) - [1 3](/guides/web/release-notes/1-3.md) - [Update your PSPDFKit for Web to version 2017.7](/guides/web/release-notes/2017-7.md) - [1 5](/guides/web/release-notes/1-5.md) - [1 6](/guides/web/release-notes/1-6.md) - [1 7](/guides/web/release-notes/1-7.md) - [1 8](/guides/web/release-notes/1-8.md) - [2017 6](/guides/web/release-notes/2017-6.md) - [2017 3](/guides/web/release-notes/2017-3.md) - [Upgrade annotations in PSPDFKit Web 2017.8](/guides/web/release-notes/2017-8.md) - [Explore new features in PSPDFKit for Web 2017.9](/guides/web/release-notes/2017-9.md) - [New features in the 2018.1 migration guide](/guides/web/release-notes/2018-1.md) - [PSPDFKit for Web 2018.2 migration insights](/guides/web/release-notes/2018-2.md) - [Explore PSPDFKit for Web 2018.4 features](/guides/web/release-notes/2018-4.md) - [PSPDFKit Web and Server 2020.4 migration update](/guides/web/release-notes/2020-4.md) - [Explore new features in PSPDFKit 2018.5](/guides/web/release-notes/2018-5.md) - [PSPDFKit for Web 2019.3 migration highlights](/guides/web/release-notes/2019-3.md) - [2019 2](/guides/web/release-notes/2019-2.md) - [Explore PSPDFKit for Web 2018.6 enhancements](/guides/web/release-notes/2018-6.md) - [Discover the new features in PSPDFKit for Web 2018.3](/guides/web/release-notes/2018-3.md) - [PSPDFKit for Web 2019.5 migration insights](/guides/web/release-notes/2019-5.md) - [Essential updates in PSPDFKit for Web 2019.4](/guides/web/release-notes/2019-4.md) - [Seamless migration to PSPDFKit for Web 2020.2](/guides/web/release-notes/2020-2.md) - [Key updates in PSPDFKit for Web 2019.1](/guides/web/release-notes/2019-1.md) - [Key changes in PSPDFKit for Web 2020.1](/guides/web/release-notes/2020-1.md) - [Upgrade to PSPDFKit Web 2020.3 seamlessly](/guides/web/release-notes/2020-3.md) - [Explore the new features in PSPDFKit 2018.7](/guides/web/release-notes/2018-7.md) - [Upgrade to PSPDFKit for Web 2021.1 with ease](/guides/web/release-notes/2021-1.md) - [Unified CRUD API enhancements for easy migration](/guides/web/release-notes/2020-5.md) - [PSPDFKit Web 2020.6 migration insights](/guides/web/release-notes/2020-6.md) - [PSPDFKit 2021.4 migration guide for seamless updates](/guides/web/release-notes/2021-4.md) - [2021 3](/guides/web/release-notes/2021-3.md) - [PSPDFKit 2023.2 migration and updates](/guides/web/release-notes/2023-2.md) - [2021 6](/guides/web/release-notes/2021-6.md) - [Migration guide for PSPDFKit 2021.5](/guides/web/release-notes/2021-5.md) - [Seamlessly migrate to PSPDFKit for Web 2021.2](/guides/web/release-notes/2021-2.md) - [Enhancements in PSPDFKit for Web 2022.2](/guides/web/release-notes/2022-2.md) - [Explore the new features of PSPDFKit for Web 2022.3](/guides/web/release-notes/2022-3.md) - [Discover the key updates in PSPDFKit for Web 2023.1](/guides/web/release-notes/2023-1.md) - [Key improvements in PSPDFKit for Web 2022.5](/guides/web/release-notes/2022-5.md) - [PSPDFKit for Web 2022.4 migration overview](/guides/web/release-notes/2022-4.md) - [PSPDFKit 2022.1.1 migration changes](/guides/web/release-notes/2022-1.md) - [2024 3](/guides/web/release-notes/2024-3.md) - [Explore key updates in PSPDFKit for Web 2023.4](/guides/web/release-notes/2023-4.md) - [Key updates in PSPDFKit for Web 2023.5](/guides/web/release-notes/2023-5.md) - [Essential Nutrient Web SDK 2024.1 migration tips](/guides/web/release-notes/2024-1.md) - [Key updates in PSPDFKit for Web 2023.3](/guides/web/release-notes/2023-3.md) - [2024 4](/guides/web/release-notes/2024-4.md) - [2024 2](/guides/web/release-notes/2024-2.md) - [2024 7](/guides/web/release-notes/2024-7.md) - [2024 5](/guides/web/release-notes/2024-5.md) - [2024 8](/guides/web/release-notes/2024-8.md) - [Upgrading Nutrient Web SDK](/guides/web/release-notes/upgrading.md)